WRONGHEADED
wrongheaded
(adjective) obstinately perverse in judgment or opinion; “a wrongheaded policy”
Source: WordNet® 3.1
Etymology
Adjective
wrongheaded (comparative more wrongheaded, superlative most wrongheaded)
Having an obstinately (persistently, stubbornly) perverse/erroneous opinion or judgement.
Source: Wiktionary
Wrong"head`ed, a.
Definition: Wrong in opinion or principle; having a perverse understanding;
perverse.
– Wrong"head`ed*ly, adv.
– Wrong"head`ed*ness, n. Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition